Simply go to Goodwill store and buy kids jeans , use the legs for making sand bags . choose skinny "8 year old size' and cut the legs off . tie off one end with plastic zip ties Fill with sand / dry beans / Styrofoam beads then zip tie the other end tightly . I use two tie's on each end . ++ stack them to the height you need .
Mine are about 8 years old now and still no leaks .
Hope this helps , Stan
Mine are about 8 years old now and still no leaks .
Hope this helps , Stan